20911246 has 8 divisors (see below), whose sum is σ = 31413240. Its totient is φ = 10440168.

The previous prime is 20911243. The next prime is 20911279. The reversal of 20911246 is 64211902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20911246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20911243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5956 + ... + 8791.

It is an arithmetic number, because the mean of its divisors is an integer number (3926655).

Almost surely, 2^20911246 is an apocalyptic number.

20911246 is a deficient number, since it is larger than the sum of its proper divisors (10501994).

20911246 is a wasteful number, since it uses less digits than its factorization.

20911246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15458.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20911246 is about 4572.8815860462. The cubic root of 20911246 is about 275.5031932990.

The spelling of 20911246 in words is "twenty million, nine hundred eleven thousand, two hundred forty-six".